What’s the best way to find a specific model and calibre of airgun

[Ajf123]

Now I’ve got the wanted add up in the correct place, here is hopefully a more appropriate question.

The thing I’m after is German made and there are more in Europe than the U.K.

While feels like it’s going to be a faff on I could in theory buy one in Europe and import it, only the idea of importing any firearm x border feels like it’s going to be really complex and I’ve no idea what one does about relative power - I do not have and do not want a FAC.

Has anyone bought an air rifle overseas and personally imported it. Presumably it would need to be checked over as being within limits before being imported.